New translation for Ubuntu

[Demuxer @gmail]

Hi team, Im from Guatemala and we have an interested group in create a new
language option/pack.
I use to translate some english strings and know how those process works
https://launchpad.net/~demuxer but now at Ubuntu Guatemala
https://wiki.ubuntu.com/GuatemalanTeam we have a large mayan people using
Kaqchikel https://en.wikipedia.org/wiki/Kaqchikel_people and we would like
to create this translation,

What is the first step?
Is it possible to have a branch from the SPANISH - LATAM ? the translators
are better with spanish than english, of course this would change in
another Ubuntu Release, but we prefer 'spanish' as a base.

Thanks for your reply
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